(ITS#5101) Fatal Error: call to undefined function ldap_connect()

Full_Name: Hariharan R
Version:
OS: Windows server 2003
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (122.164.140.2)
Hi,
I am using openldap with php. I am getting, fatal error:call to undefined
function ldap_connect()...I modified the php.ini file removing the ; in
extension ldap.dll....
But still i get the same error...Could anybody help me to resolve this...I also
need step by step procedure to configure Openldap once again with php...
Thanks
Hariharan.